Mohammed A. Physical-chemical analysis of the components distribution between phases in the direct alloying to improve efficiency and providing specified product properties

Ahmed Abdelkarim A.M. (Physical-chemical analysis of the components distribution between phases in the direct alloying to improve efficiency and providing specified product properties) The thesis for scientific degree of candidate of technical science in specialty 05.16.02 -metallurgy of ferrous and non ferrous metals and special alloys, National metallurgical Academy of Ukraine , Dnepropetrovsk , 2012 The thesis aims at the development of the theoretical development of the process of direct alloying of iron-carbon alloys, development of resource-efficient and energy-efficient technologies with direct alloying reduction potential melt. Summarized results of theoretical and experimental studies of complex processes direct doping melts. With the use of modern techniques of high-temperature studies obtained reliable information on the kinetic characteristics of direct alloying of high-melt Found that most rational scheme of direct doping is due process separation into two stages: 1 - doped nickel alloys, reduced from its oxide ,by carbon and silicon in melt 2 - doping melt complex alloying metals, with aluminum recovered heat the mixture on the surface alloyed nickel melt. Experimentally established possibility of achieving a low content of oxygen and sulfur in the finished steel (0.00231% and 0.004%) by direct doping melt in two-stage scheme of direct alloying through the implementation of the following technological operations: use desulfurization capacity drops reduced manganese in the second stage and additives CaO in the thermal mixture of oxides of alloying elements of the second stage. Achieved degree desulfurization melt is about 60%. Rationality and to some extent the universality of the developed dual-circuit direct alloying of high-melt confirmed the research process using a number of waste, allowing them to recycle and return to the main production. Keywords: thermodynamics, kinetics, cast iron, direct doping, reduction potential, speed recovery, aluminothermy, industrial waste, the mechanism of the process.